Machine for threading and cutting off pipe



No. 625 .088. Patented May l6, I899.

n. P. & L. B. curms. MACHINE FOB THREADING AND CUTTING OFF PIPE. (Appljcation filed Dec. 31, 1897. Renewed Nov. 4, 1698.)

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No. 525,088. Patented ma l6, I899. n. P; a L. B. cums.

MACHINE FOR THBEADING AND CUTTING OFF, PIPE.

(Applicatian filed Dec. 31, 1897. Renewed' Nov. 4, 1898.) (No Model.) 2 Shoots-Sheet 2.

WITNESSES:

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ATTORNEY THE uonms PETERS cu. PHuvo-uma. WASHINGTON, o. c.

. whereby a pipe may be threaded or cut off ing the manner in which our invention is UNITED STATES,

PATENT OFFICE.

RODERICK P. CURTIS AND LEWIS B, CURTIS, OF SOUTHPORT, CONNECTICUT,

ASSIGNORS TO CURTIS & CURTIS,

OF BRIDGEPORT, CONNECTICUT.

MACHINE FOR THREADING-AND CUTTING OFF PIPE.

SPECIFICATION forming part of Letters Patent No. 625,088, dated May 16, 1899.

Application filed December 31, 1897. Renewed November 4, 1898. Serial No, 695,516. (No model.)

To aZZ whom it may concern.-

Be it known that We, RODERICK P. Cu'nrrs and LEWIS B. OURTIs, citizens of the United States, residing at Southport, in the county of Fair-field and State of Connecticut, have invented certain new and useful Improvements in Machines for Threading and Cutting Off Pipe; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Ourinvention relates to certain new and useful improvements in machines for threading and cutting off pipes, but more particularly has reference to the provision of certain means when it projects beyond the face of the machine to the extent that it would interfere with any crank or ratchet lever operated in a plane at right angles to the axis of the pipe to be threaded or cut off.

The object of our invention is to provide a means for operating upon the pipe in a plane that is substantially parallel to the axis of the pipe, so that whether in the threading or the cutting-off operations there will be no interference whatever with the pipe.

With these ends in view our invention consists in certain details of construction and combination of parts such as will be hereinafter fully set forth and then specifically designated by the claims.

In the accompanying drawings, which form a part of this application, Figure 1 is a horizontal section of a pipe-threading machine, showing our invention applied to a construc-, tion which embodies a stationary casing and a toothed die-carrying ring adapted to' slide within such casing; Fig. 2, a similar view, but showing a modification of such construction Fig. 3, a horizontal sectional View showpreferably applied in instances where the diecarrying ring is stationary, while the pipesupporting vise is capable of sliding toward said ring; and Fig. 4, aview similar to Fig. 3, but illustrating a modification thereof.

Similar numbers of reference denote like parts in the several figures of the drawings. In the practical application of portable .pable of sliding, so as to bring will now describe the construction of such pipe-threading machines it frequently happens that the pipe extends beyond the face of the machine, and it is therefore extremely difficult and well nigh impossible to either thread the pipe or cut off the same by means of a crank or lever attached to an axis of rotation which is parallel to the pipe, for the reason that such lever or crank will be arrested in its rotary movement by the pipe itself. Therefore it has hitherto beennecessary to attach a ratchet-wrench to the shaft of the pinion which operates the die-carrying ring and to revolve the cut-off tool by a series of short intermittent movements; but this is a slow and tedious operation and the die-carrying ring must necessarily berotated very slowly owing to the intermittent movements of the ratchet or other lever.

Our present improvement has nothing whatever to do with the'construction or the feed of the cutoff or threading tools, but merely relates to a new means for rotating the die or cutter carrying ring without interference with the pipe to be threaded or out.

In the adaptation of our improvement it is immaterial whether the threading or cut-ofi 'toolsare led up to the pipe or whether these tools are stationary and the pipe itself is led up to them, and we have illustrated .a construction of'pipe threading and cut-0E machine where a rotary die carrying ring is adapted to slide within a casing, While the pipe-holding vise is stationary, and we have also shown a rotary die-carryin g ring within a casing, but stationary as to any sliding movement, while the pipe-holding vise itself is cathe pipe up to the operating-tools.

Our invention is especially applicable to that classof pipe'threading machines which employs a casing, a rotary toothed ring which carries thethreading or cut-0E tools, and a pinion for rotating such toothed ring, and we r machine where the ring slides parallel with its axis within the casing while the pipe-hold ing vise is stationary.

1 is the casing; 2, the toothed rotary diecarrying ring; 3, the pinion, whose teeth engage with the teeth on said ring, so as to rotate the latter, and 4 is the pipe-holding vise,

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which is stationary with the casing and is at the rear thereof.

In machines of this description lead-screws are frequently employed for the purpose of automatically leading the die-carrying ring up to the pipe to be threaded; but such devices have nothing to do with our present invention, and, in fact, it is immaterial whether a lead-screw be employed or whether the diecarrying ring is thrust inward toward the pipe by means of the hand or other devices.

In pipe-threadingmachines of the class to which this invention relates the axes of the die-carrying ring and the operatingpinion are parallel with the axis of the pipe to be operated upon, and therefore when this pipe projects beyond the face of the machine a ratchet-wrench or crank-handle attached to the shaft of the pinion would interfere or strike against such pipe during rotary move ments. In threading large sizes of pipe this interference with the pipe itself would amount to nothing, since the threading operation would have to be effected, primarily, by means of a ratchet-wrench whose action is of course intermittent; but the threading of small sizes of pipe, as well as the cutting off of any pipe, may be readily accomplished by a continued rotation of the ring which carries the threading or cutting-off tools, and it is therefore very necessary that our present improvement should be adapted for use without in the slightest. degree interfering with the usual manner of rotating the ring by means of the pinion which engages with the teeth on the periphery of the ring and whose axis is parallel with the axis of the pipe to be threaded. It would therefore not answer the purposes of our invention to employ any auxiliary worm or pinion which should mesh with the usual teeth on the periphery of the die-carrying ring, the object of the present invention in this respect being to provide two distinct and independent sets of gearing for operating the ring, the primary shafts to which the wrench-hold lever is attached in each instance being at right angles to each other. 7

Referring particularly to Figs. 1 and 2, we have shown a construction in which the diecarrying ring is rotated by an elongated pinion, so that such ring is capable of sliding along the teeth of the pinion during the time when the threading-dies are advanced along the pipe. In carrying out our improvement in connection with this style of machine we provide a bevel-gear 5, which is mounted on the end of a shaft 6, that extends in a horizontal plane at right angles to the shaft 7 of the pinion 3, this shaft 6 being suitablyjournaled within a bracket 8, that is bolted or otherwise secured to the casing, at one side thereof. On the rear end of the shaft 7 is mounted a bevel-gear 9, which meshes with the gear 5, so that it will be clear that when a wrench or other lever is applied on the shaft 6 to rotate the same the pinion 3 will thereby rotate the die-carrying ring. It will thus be seen that when the pipe extends through the die-carrying ring and beyond the face thereof it would interfere with the rotation of a wrench or lever secured -to the shaft 7, but that by transferring this lever to the shaft 6 the die-carrying ring may be readily and continuously rotated for the purposes either of threading the pipe or of cutting off the same.

It is immaterial whether the gear that meshes with the gear 5 is on the pinion-shaft 7, so as to rotate the die-carrying ring indirectly through the medium of the pinion, or whether such gear is carried by the ring itself, and therefore we have shown at Fig. 2 a bevelgear 10, carried by the rear of the die-carrying ring.

In the construction shown at Fig. 1 the bevel-gears are always in engagement, whereas in the construction shown at Fig. 2 the gear 10 is not in engagement with the gear 5 until the die-carrying ring has been forced inward to the limit of its movement in that direction. In both instances the usual pin 11 is inserted through the casing immediately in front of the die-carrying ring when the cutting-01f operation is to be performed, in order that it may be confined as against any tendency to thrust outward.

Referring to Figs. 3 and 4:, we have shown our invention applied to pipe-threading machines in instances where the die-carrying ring is stationary as to any sliding movement, while the vise itself, which carries the pipe to be threaded, is arranged to slide toward the ring.

At Fig. 3 we have shown a separate vise 12, supported upon dowels 13, which latter extend from the casing, said vise being capable of a sliding movement along these dowels. The die-carrying ring is stationary as to any sliding movement within the casing and is actuated from the pinion-shaft 7 precisely in the manner shown at Fig. 1, and the auxiliary bevel-gearing employed for the purpose of rotating this pinion-shaft is precisely the same as to its construction, arrangement, and operation as is shown at Fig. 1.

In the construction shown at Fig. 4. the die carrying ring is stationary as to any sliding movement in the casing and is ordinarily operated by means of the pinion upon the usual shaft 7, and the bevel-gearing employed to in dependently rotate this ring is precisely the same as to its construction, arrangement, and operation as is shown at Fig. 2. In this Fig. 4 the vise is independent of the casing, but is constructed with a base portion 14, which is capable of sliding within ways 15 in the bed 16 of the casing. The vise is moved toward or away from the threading-dies by any suit able means, which we have not shown, since it forms no part of our present invention and is, moreover, quite ordinary. It will thus be seen that it is quite immaterial in carrying out our invention whether the die-carrying ring slides or not, and also that it is likewise ferentially Within such casing and without any axial support and capable of rotating therein, the combination of the rotary toothed ring, the pinion for operating said ring, the independent bevel-gear carried by a part moving in harmony with said ring, and the auxiliary bevel-gear meshing with the firstnamed bevel-gear and mounted upon a shaft whose axis is in a horizontal plane at right angles to the axis of said pinion, whereby said ring may be rotated directly by the pinion or indirectly by means of said bevel-gearing, substantially as set forth.

2. In a machine for threading and cutting off pipe and which comprises an external casin g and a toothed die-carrying ring supported circumferentially within such casing and without any axial support and capable of rotating therein, the combination of the rotary toothed ring, the elongated pinion for oper atin g said ring and provided at one extremity with a wrench-hold and having a bevel-pinion secured on the other extremity, and the auxiliary bevel-gear meshing with the firstnamed bevel-gear and mounted upon a shaft whose axis is in a horizontal plane at right angles to the axis of said pinion, whereby said ring may be rotated directly by the pinion or indirectly by means of said bevelgearing, substantially as set forth.

In testimony whereof we aifix our signatures in presence of two witnesses.

Witnesses:

F. W. SMITH, J12, M. T. LONGDEN. 

